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An "offline" computer is a device that is not connected to a network, particularly the internet. This can also mean that a device is not turned on or is not in a ready state, even if it is physically connected to another computer. For example, a printer that is turned off is considered offline.

Key aspects of "offline"

Disconnected from the internet: This is the most common meaning, implying a device lacks network connectivity.

Not functioning: In some contexts, "offline" can mean a device is not working properly, even if it's physically connected. For example, a peripheral like a printer might be "offline" because it has run out of paper or is in an error state.

Physical separation: It can also refer to a system or device that is deliberately disconnected from a larger network, such as a server taken offline for maintenance.

Offline activities: The term extends to actions performed without an internet connection, such as downloading files for later viewing or composing emails in a program before sending them.